drm/amd/display: Prevent master programming in multisync

Verify that the stream is master - and program only the slave displays
Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -2348,7 +2348,7 @@ static void set_master_stream(struct dc_stream_state *stream_set[],
 		}
 	}
 	for (j = 0;  j < stream_count; j++) {
-		if (stream_set[j] && j != master_stream)
+		if (stream_set[j])
 			stream_set[j]->triggered_crtc_reset.event_source = stream_set[master_stream];
 	}
 }

drivers/gpu/drm/amd/display/dc/core/dc.c

@@ -521,11 +521,13 @@ static void enable_timing_multisync(
 		if (!ctx->res_ctx.pipe_ctx[i].stream ||
 				!ctx->res_ctx.pipe_ctx[i].stream->triggered_crtc_reset.enabled)
 			continue;
+		if (ctx->res_ctx.pipe_ctx[i].stream == ctx->res_ctx.pipe_ctx[i].stream->triggered_crtc_reset.event_source)
+			continue;
 		multisync_pipes[multisync_count] = &ctx->res_ctx.pipe_ctx[i];
 		multisync_count++;
 	}
 
-	if (multisync_count > 1) {
+	if (multisync_count > 0) {
 		dc->hwss.enable_per_frame_crtc_position_reset(
 			dc, multisync_count, multisync_pipes);
 	}

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c

@@ -1097,7 +1097,7 @@ static void dcn10_enable_per_frame_crtc_position_reset(
 
 	DC_SYNC_INFO("Waiting for trigger\n");
 
-	for (i = 1; i < group_size; i++)
+	for (i = 0; i < group_size; i++)
 		wait_for_reset_trigger_to_occur(dc_ctx, grouped_pipes[i]->stream_res.tg);
 
 	DC_SYNC_INFO("Multi-display sync is complete\n");